Social Bookmarking
Social bookmarking is a method for Internet users to store, organize, search, and manage bookmarks of web pages on the Internet with the help of metadata. In a social bookmarking system, users save links to web pages that they want to remember and/or share. (www.wikipedia.com)

Social Bookmarking Sites:

Delicious
Diigo
Stumble Upon
Digg

Sample of Social Bookmarking:

www.delicious.com/robkmil
www.delicious.com/dscalzo